<template>
  <!-- 底部 -->

  <div class="my-footer">
    <!-- 全选 -->

    <div class="custom-control custom-checkbox">
      <input
        type="checkbox"
        class="custom-control-input"
        id="footerCheck"
        v-model="isall"
      />

      <label class="custom-control-label" for="footerCheck" type="checkbox">
        全选</label
      >
    </div>

    <!-- 合计 -->

    <div>
      <span @>合计:</span> <span class="price">¥ {{ sum }}</span>
    </div>

    <!-- 按钮 -->

    <button type="button" class="footer-btn btn btn-primary">结算 ( {{count}})</button>
  </div>
</template>

<script>
export default {
  props: ['list'],
  computed: {
    isall: {
      get() {
        return this.list.every((item) => item.goods_state)
      },
      set(val) {
        this.$emit('checkall', val)
      },
      
    },
    sum(){
     return  this.list.filter(item=>item.goods_state===true).reduce((prev, item)=>prev+item.goods_price * item.goods_count,0)
    },
    count(){
     return  this.list.filter(item=>item.goods_state===true).reduce((prev, item)=>prev+item.goods_count,0)
    }
  },
  data() {
    return {
      // sum: 0,
    }
  },
  // watch: {
  //   list: {
  //     deep: true,
  //     immediate: true,
  //     handler() {
       
  //      this.sum= this.list.filter(item=>item.goods_state).reduce(
  //         (prev, item) => prev + item.goods_price * item.goods_count,
  //         0
  //       )
        
  //     },
  //   },
  // },
  
}
</script>

<style lang="less" scoped>
.my-footer {
  position: fixed;
  z-index: 2;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;
  background: #fff;

  .price {
    color: red;
    font-weight: bold;
    font-size: 15px;
  }
  .footer-btn {
    min-width: 80px;
    height: 30px;
    line-height: 30px;
    border-radius: 25px;
    padding: 0;
  }
}
</style>
